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TI-2017-08737 Aliases CVE-2017-11786GHSA-2xjh-35wj-vw46

Authentication bypass by capture-replay in Microsoft Skype for Business

Priority MEDIUM 50CWE-294Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-294.

Summary

Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."

Why it matters now

EPSS 0.09392 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftSkype for BusinessMicrosoft Lync 2013 SP1 and Skype for Business 2016—No fix listedCNA
  • Skype for Business VendorMicrosoft Affected Microsoft Lync 2013 SP1 and Skype for Business 2016 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*2013 sp1VulnerableMicrosoft
cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*2016VulnerableMicrosoft
  • cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:* Versions 2016 Vulnerable ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-11786
  2. 2026-10-03 Alias added: GHSA-2xjh-35wj-vw46

References

Patch 1

  • TI-2015-01495 The Windows DirectWrite library, as used in Microsoft .NET Framework 3.0 SP2, 3.5, 3.5.1… KEVCVSS 3.1HIGH 7.8
  • TI-2013-03410 GDI+ in Microsoft Windows Vista SP2 and Server 2008 SP2; Office 2003 SP3, 2007 SP3, and… KEVCVSS 3.1HIGH 7.8
  • TI-2015-02157 Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows… CVSS 2.0HIGH 9.3
  • TI-2016-06177 The Graphics component in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2… CVSS 3.0CRITICAL 9.8
  • TI-2016-00122 The font library in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1… CVSS 3.0HIGH 8.8
  • TI-2015-02207 Buffer overflow in the Adobe Type Manager Library in Microsoft Windows Vista SP2, Windows… CVSS 2.0HIGH 9.3
See all 42 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences